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I've never seen a calculator with display clarity problems.
The only option I could think to offer you is to attempt to adjust the contrast. However, I'm not sure whether or not your TI-89 actually has an option to change the contrast. Because I own a TI-89 Titanium - and although its a wonderful calculator - it does not allow the user to alter the darkness/brightness of the display.
Call Texas Instruments: 1-800-TI- CARES...They are pretty helpful with common questions like this.
Well, of course you can replace it, but it would probably be more productive to buy a new one due to the time it takes to replace it and it's individual cost, not to mention it wouldn't be easy to find.
Have you activated the split screen feature? That could explain the apparent defect. Anyway, to know how much it would cost you to replace the screen you should contact Texas Instruments at [email protected]. They should be able to advise you, given your country of residence.
Try doing a hard reset (hold simultaneously Left + Right + 2nd + On). If it just isn't wanting to display properly, but does turn on, that might help. I think you can do the same thing by taking the four AAA's out and the spare CR1616/CR1620. Otherwise, the battery acid probably ate one of your components and it's time to repair/replace your handy-dandy.
Hey, i have nearly the same problem and now finally found a solution to it.
In my case half of the screen was empty and the other worked correctly AND slight pressure to the frame surrounding the display on the side of the defect half and/or above the display makes the display reappearing again. Because it's annoying if you always have to press with one hand on your calculator while working with it i did the following:
Important: Make sure that...
... you have a backup of the data stored on your TI because you could lose them during the following procedure.
... we are really talking about the same problem.
... this hints come without any warranty and you might destroy your calculator completely following this advice.
1. Open your TI 89 as described for example in [1]
2. Take a piece of foam rubber and cut out a stripe with a shape like |_ or "L", about 1cm in width which fits approximately the frame around the display on the the defect side and the top.
3. Place the foam rubber on the silver shield you see after opening the back of your TI.
4. Then you can assemble your calculator again.
I hope i could help you!
[1] http://richfiles.solarbotics.net/Turbo89.html
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